Blast-furnace



(No ModeL) J O, BENNETT- Blast Furnace.

No. 242,103. Patented May 31,1881.

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UNITED STATES PATENT OFFICE.

JAMES C. BENNETT, OF CHICAGO, ILLINOIS.

BLAST-FURNAC E.

SPECIFICATION forming part of Letters Patent No. 242,103, dated May 31, 1881. Application filed November 24, 1880. (No model.)

To all whom it may concern:

Be it known that I, JAMES C. BENNETT, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Blast-Furnaces and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being had to the accompanyingdrawings, which form. part of this specification.

My invention relates to an improvement in furnaces 5 and it consists in one or more surrounding chambers attached to the base of a blast-furnace that is closed at its top during operation by a hell or other suitable device and open at its bottom, and that is provided with a series of tuyeres along its sides, whereby the vaporized products of combustion are compelled to pass down through the bottom of the furnace into the chamber, while the liquid products drop down from the bottom of the crucible upon the hearth below, as will'be more fully described hereinafter.

Figure 1 is a vertical section of my in vention, and Fig. 2 is a horizontal section of the same, taken through the exits forthe products of combustion.

a represents the furnace, of any desired shape, size, or construction, and which hasits top closed by the bell. After the furnace has been charged this bell is closed, so as to prevent any of the products of combustion from escaping at this point, and as openings 0 are made through the lower part of the crucible d all of the products of combustion are necessarily forced to pass downward through the charge in order to reach these openings,

Passing around the lower part of the furnace, at any convenient height, is the bustlepipe 0, and passing up along the sides of the furnace are the blast pipes g, from which tuyeres pass into the furnace at different elevations. The tuyeres that pass into the crucible are arranged more closely together than those that pass into the furnace, and all of the tuyeres are provided with cut-offs, so that any one or number of them can be closed, as the circumstances may require. The blast being downward, the whole products of combustion pass directly through the crucible.

The fusion never takes place above the tuyeresin operation in the crucible. The liquid products of the furnace drop down upon the hearth and are tapped off at h, while the vaporized products pass through the openings into the chamber 1', that nearly surrounds the lower part of the furnace, and from which chamber they can be led away to any desired place for further treatment, or, if of no practical value, for escape.

This apparatus forms one or more hot-air chambers around the lower part of the furnace, which, in addition to the downward passage of the products of combustion, not only aids in causing a more perfect reduction of the ore and burning out of its impurities, but will keep the charge longer without cooling.

No claim is made in this application to a furnace provided with hot-blast stand-pipes and tuyeres extending to the top, and that is closed at its top and open at its bottom, for such a furnace is claimed in another application heretofore made by'me for other Letters Patent.

Having thus described my invention, I claim- 1. In a blast-furnace provided with a-suitable device for closing its top during operation, open at its bottom, and provided with a series of tuyeres extending to its top, so as to cause a down ward blast, the chamber 2' around the base of the furnace, into which the vaporized products of the furnace pass, while the liquid products drop downward upon the hearth, substantially as above set forth.

2. The combination of the furnace to, pro vided with a suitable device for closingits top while in operation, and having an open bottom, through which the reduced metal and the products of combustion pass, and a series of openings, 0, with the tuyeres for producing a downward blast, and one or more chambers, t, surrounding the base of the stack, substantially as described.

In testimony thatI claim the foregoing I have hereunto set my hand this 15th day of February, 1879.

J. (J. BENNETT.

Witnesses:

F. A. LEHMANN, D. TORREY. 

